LANCE II SERVICE
MANUAL
11-80. OPERATION OF
EXTERNAL POWER RECEPTACLE.
(Refer to Section II,
Paragraph 2-21.
11-81.
INSTRUMENT AND PANEL LIGHTS.
The instrument and panel lights
are broken
up into
five groups; Upper Panel Lights, Lower
Panel Lights, Console Lights, Coupler
Lights
and
Compass Light. The instrument lights
are controlled by a 5 amp circuit breaker
through
a
transistorized dimmer.
The dimmer control
is located in
the middle of the
instrument
panel
just above the pedestal. There is one
control knob connected to a varible resistor
that
controls
the intensity of the instrument lights.
There is a second control knob connected
to
a varible resistor which controls
the light intensity for all the avionic
equipment. It may be
necessary to gain access to
the Dimmer Control Assembly; if so follow
the instructions given
below.
11-82.
REMOVAL OF
DIMMER
CONTROL
ASSEMBLY.
a. Access
to
the Dimmer
Control
Assembly
is from
beneath
the instrument
panel.
b. Disconnect
the electrical
connection
from
the assembly.
c.
Remove
the
two screws
securing
the
assembly
to the
instrument
panel.
d. Remove
assembly
from
the
airplane.
11-83. INSTALLATION
OF DIMMER
CONTROL ASSEMBLY.
a.
Position
the assembly
in the
instrument
panel
with
the
control
knobs
inserted
into
their appropriate slots.
b.
Secure
the assembly
to
the instrument
panel
with
the two
screws
previously
removed.
c.
Connect
the
electrical
connection
to the
assembly.
d. Check
operation
of Dimmer
Control
Assembly.
11-84.
ANNUNCIATOR
PANEL.
11-85.
DESCRIPTION.
The annunciator
panel is
a small
cluster of
lights which
warn
of
malfunctions
in the
various
circuits or
systems.
A malfunction
is identified
by the
illumination
of an
individual
warning
light.
There
are three
warning
lights on
the
PA-32RT-300
models
and
four warning
lights
on the
PA-32RT-300T
models.
Power
is
supplied
from
the bus bar
through
a 5 amp
fuse located
behind
the circuit
breaker
panel.
The VAC
warning
light is
controlled
by a vacuum
sensor
switch
located
at the bulkhead
and is
attached
to the
vacuum
regulator.
The sensor
switch
will activate
when
the
differential pressure is below 3.5 in. Hg.
The OIL
warning
light is controlled
by an oil
pressure
sensor switch
incorporated
in the
oil line to
the oil
pressure
gauge and
is located
at the
bulkhead.
The sensor
switch
will
activate when
the oil pressure
is below 35 psi.
The
ALT
warning
light
is illuminated
by
current
flowing
from
the bus
bar
to the
alternator
circuit.
This
condition
exists
when the
alternator
is not operating
properly
and
the output
is zero.
During normal
operation,
the
alternator
warning
circuit
is also supplied
with
power from
the top
diode terminal.
This
current
flows through
a
5 amp fuse,
located
above the
diode heat
sink, to
the resistor
and diode
creating
a no-flow
condition
which
does
not
allow the warning
light to light.
IssIed: 1/3/78
2ELECTRICAL
SYSTEM
2H14
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